Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
Warning: This feature is deprecated in favor of defining setters using the object initializer syntax or the
However, as it is widely implemented and used on the Web, it is very unlikely that browsers will stop implementing it.
__defineSetter__ method binds an object's property to a function to be called when an attempt is made to set that property.